Screen-shoe-leveling mechanism for harvesters.



W. M. RHODES.

SGREEN SHOE LEVELING MEGHANISM POR HARVESTERS.

APPLIGAToN FILED Nov.15, 191s.

Patented DBG. 29, 1914.

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W. M. RHODES.

SCREEN SHOE LEVELING MEOHANISM FOR HARVESTERS.

APPLICATION FILED NOV. 15, 1913.

1,122,803., I Patented De@.29,1914.

3 SHEETS-SHEET 2.

. RHODES.

SCREEN SHOE LEVELING MEGHANISM POR HARVESTERS.

APPLICATION FILED NOV. 15, 1913. 1,1 22,893. Patented Dee. 29, 1914.

3 SHEETS'SHEET 3.

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.WILLS M. B HQDES, `0]. MOSGQW, IDAHQ SCREEN-SHQE-LEVELING MECHANISMFOR HARVESTERS.

Application and mvember v15, ma. serial m. comes.

To all whom 'it may concein Be it known that I, WILLIS M. Briones, citizen of the United `States, residing at Moscow, in the county of Latah and State of Idaho, have invented certain new and useful Improvements in Screen-Shoe-Leveling Mechanisms for Harvesters, of which the following isa specification.

My invention relates to agricultural ma4 ohinery and particularly to what are known as combined harvesters. In this form .of harvesterl threshing machinery is combined with reaping machinery.

The primary object of my invention iS the provision of means for supporting the screening shoes of threshing machines of this type in an approximately horizontal position at all times, whether the machinefisA ascending or descending a hill or moving over a level surface. f

A further object is to rovide in Connemtion with mechanism for iolding the screenv ing shoes in a horizontal position, means for properly shifting the wind-'boards in conso-` nance withfthe shifting of the screening shoes relative to the body of the threshing machine.

A further object of the invention is to provide means whereby the level of the screening shoes may be adjusted, and wheref bv the direction of the wind-boards in relal tion to the screening shoes may ,be adjusted,

A further object of the invention is to provide gravity actuated means for automatically holding the wind-boards and screening shoes in a horizontal position at all times.

A further bbject is to provide means whereby the angular position of the screening shoe and wind-board may be adjusted both with relation to each other -and with relation to the machine as a whole, and in this connection to provide means whereby the angular relation of the screening shoe and wind-board may be adjusted within certain limits while the machine is running.

Still another object is to provide springs so arranged as to'assist the gravity actuated means in counterbalancing the screening shoe or shoes and 'changing the angularpositionof the screening shoe and wind-board.

My invention is illustrated the accom-1 panying drawings wherein: Figure 1 1s a side elevation of the rear end of the threshe' ing machine casing such as is used in connection with reaping .mechanism in acera:

` Specification of Letters Patent.

.billed harvester.

- upon rai s.

Patented Dec. 29, 193ML.

0 n Fig. 2 is a fragmentary longltudllll -vertical section through the lower shoe, the lower fan casing, the conveyer and the corresponding wlndboard. Fig. .3 1s a perspective detail View of the t e w1nd-b0ard and the mechamsm for controlling the movements of the shoe and wind-board. Fig. 4 is a detail seotion on the line of ,ei 5 showing the means for supporting the me from longitudinal movement. Fig. 5 is a fragmentary elevation showing the means for supporting the shoe for reeiprocation. Fig. 6 is a perspective detail View 0f the end of the shoe leveling Shaft and vallied. parts- Correspendmg and like parte are referred to 111 the following description and indicated lll all the views of the accompanying draw- Aings bv the vsame reference characters.

yReferring to thedrawings and more par.- tic'ularly te Figs. 1 and 3, 2 designates a Casmg at the rear end of a threshing machine adapted tobe used in connection with reaping mechanism in aV combined harvester. Disposed within this casing is the lower screen shoe 3 which is illustrated partially in dotted lines in Fig. 1. DSpQSed rearward of this shoe is the blower casing 4; having therein the shaft 5 carrying the radiating blowenfans- 6 of any usual construction. Disposed immediately rearward of the casing4 is the conveyer casing 7 having therein a spiral eonveyer 8.

Extendingtransversely across the casing 2 is the sha 't 9 and pivotally mounted upon this shaft are the parallel angle iron supports 10, These supports are angular in cross section and at their front ends each angle iron is formed with an eye l1 loosely embracing the shaft 9 as illustrated clearly in Fig. 3. The shoe 3 is slightly narrower than the space between these supportingl members 10 and is provided with rollers resting u on these supporting members as The particular mounting of these rollers will be'laterstated, Extending across the casingi2 and mounted in suitable bearings therein is a rock shaft 12, and eX- tending from this rock Ishaft and rigidly mounted thereon are the supporting arms 1 3. These arms extend rearward parallel to the sides of the shoe above the angle irons 10 and are linked at their extremities to the extremities of the angle irons 'by means of links 1 4. it will be obvious now that when the rock shaft 12 is rockedin imedirection, the rear ends of the arms W111 be llfted. thus lifting the rear end of the shoe, and that when the rock shaft is turned in the other" direction the supporting memberslO will be moved downward and the shoe will be permitted to move downward with them.

' rThe shoe is reciprocated by means of ec-j centrics 15- mounted upon the shaft 9 in ward of the eyes 11, these eccentricsengaging with heads 16 formed upon the forwardsprocket wheel 21 and the sprocket chain 22, and it will be seen that upon a constant rotation being given to this shaft 9, the shoe 3 will be reciprocated by the eccentrics 15.

The rock shaft 12 extends out through the side of the casing 2 and mounted loosely on this rock shaft is a radius rod 23 and keyed to the rock shaft. is an arm 24 as shown clearly in Fig. 6. 'Pivotally supported in any suitable manner upon one ofthe supporting bars 25 of the -side of the casing 2 is the triangular yoke 26. This is pivotally supported upon a bolt or like member 27. Pivotally mounted upon thisl bolt or like member 27 is the pendulum rod 28 which at its lower end has attached toit a Weight 29.

This pendulum rod is bolted to the arcuate web 30 connecting the arms of the triangular member 26, this bolt being designated 31..

A connecting rod 32 is formed with: an leye 33 at one end through which a bolt 34 passes4 connecting the rod 32 to the arcuate web- 30. The other end of the rod 32 is formedv with an eye as illustrated in Fig. 6 through which passes the bolt or pin 34. This bolt or pin i passes through the free end of the radius rod 23 and also through the eye of an eye-' bolt 35. The screw threaded end ofV this eye-'bolt passes through an elongated eye 36 fox-med on the lower end of the arm 24. 'A wing nut 37 engages'this screw threaded end of the eye-bolt and bears against thejend of the eye 36. The arm 24 is'provided with a plurality of perforations 2 4F14 fora purpose to be later stated. r

To .the forward end of the triangular or segmental yoke 26 is pivotally attached a connecting clevis 38 which extends rearward and is connected to a coiled spring l39 which in turn is connected to an adjusting eye-bolt 40. This eye-bolt passes through a bracket 41 and is provided with'a wing nut 42 whereby tension upon the sprlng mayr be increased@ decfeesel ThQWtb 30 iSIlp' vided withA a pluralty'of'holes '43 within which the pin 44, engaging the connectin clevis 38 with the web 30, maybe inserte Depending immediately above the pendui lum and in line therewith is a coil spring 45 "slightly less in strength than the spring 39.

The lower end of this spring is connected by means .of a link 46 to the pendulungrod 28 by a bolt disposed immediately above the bolt 31; The upper end of the spring is connected to anadjusting bolt -47 which passes up through a bracket 48 and is provided with a wing nut' 49 whereby the tension of the 'spring 45 may be adj usted.- y

Y It will be obvious that under normal circumstances, as for instance where the ma.- chine is moving over level ground, the pendulum will hangvertically. The'weight of the shoe-3 will tend to'cause a depression of the rear ends of the supporting arms 13 'and arotation of the shaft 12, and this rotation of the shaft 12 will be resisted not only 'by the Weightl of the pendulum'but by theV action of the spring 39,' this spring 39. and the weight 29 in this position of the parts c'ounterbalancing the weight of the shoe. When, however, the machine mores over an -upwardly inclined surface, as in moving up hill, gravity will cause the weight 29 and pendulum rod 28 to shift toward the rear end of the machine, that is, toward the left in Fig. 1. This ,will cause a pull to be exerted upon the rod 32 turning the rock shaft 12 in a direction to lift the rear end of the shoey and hold thefshoe level. It will also be obvious that the greater the inclination of the hill, the greater will be the rearward movement of the pendulum 29 and thatunder all circumstances therefore the pendulum will automaticallyvhold the shoe horizontal. When the machine is traveling down hill, the same effect will occur, except that the pendulum then will move toward'v theforward end-of themachine, that is, toward the right in` Fig. l which will push upon the rod 32,'turning theshaft 12 in a reverse direction so as to tip the rear` end of the shoe and thus'hold it in a horizontalV Y position.

movement'of the pendulum and of the yoke 26, the spring 39 will contract, and as it c'ontracts its tension will be decreased, while when the yoke 26 is moved toward the forward end ofthe machine, the tension of the spring 39 will increase. It is in orderto provide means for assistmg the action ofmovement of the pendulum. When the pendulum moves toward the rear -end of the machine, however, as when the machine is 1t will be seen that lupon a rearward.

Afnvin'gl upa hill, spring 39 as it contracts will lose somewhat of its tension but at this timethel connecting rod 46 will move past the center 2 7 of the yoke 26 and the spring will commence toiexert a tension so that chine is moving down hill md the pendulum moves toward the right in Fig. 1, the spring 39 will be expanded and will constantly 1ncrea's'e in tension so as tov resist more and more the movement of the yoke 26 toward the front of the machine. This increased resistance of the spring 39, however, will be compensated for by the spring 45 which as the connecting rod 46 moves toward the right past the center` 27, will commence to exert its tension to move the .yokeJ 26 toward the right, v tlius exerting its tension against the spring 39. The tension of these springs o 39 and 45 may, of course, be adjusted at any time and to any degree by meansof the wing nuts 42 and 49.

It is, of course, necessary to provide a wind-board -for delecting the air coming having Fig. 3. f

from the blower casing 4 up through the screen 20. Such a wind-board is illustrated' in Fics. 2 and. 3 and designated 50. This vvindhoard is mounted upon a rock shaft 51; a crank arm 52 as shown clearly 1n ltfis obvious that this wind-board must be heldin certain relation to the screen at all times, and that if the machine is moving up hill andthe shoe is held horizontally, that is, canted with relation to a plane passing longitudinally through the machine, the

wind-board must also be turned to hold it A in constant relation to the shoe, and it is also obvious that the same result must be accomplished when the machine 1s moving down hill and the shoe is held in a horizon-4 tal position. To this end I connect the crank arm 52 of the shaft 5l by `means of aconnecting` rod or link 53 tothe arm 24, therextremitv of the rod 53 being formed with an eye through which passes a bolt or pin 55 engaging any one of the perforations 24*1 in the arm 24. .The crank arm 52 is also .;.thi's pin holding the link intfiu be' pinsf `and57 at one or the other end ofv '60 formed with 'a plurality of perforations 56l through .any one of which a pin 57 passes, 53 to the crank obvious that by adjusting the pendulum 29 and the springs 39 and 45, the v'vind-board`vvill turn and that this 'windboard will alwaiyl's bear its proper relation to the screen whet er the machine be going up hill, down hill or be moving over level ground. By adjusting the pin 34 in any one of the perforations in the arcuate web 30, thefangle of the shoe may be adjusted and that this adjustment may also be accomplished by adjusting the pin 44 in any one of the perforations 43. l'

The whole system of levers and the system of shoe adjiistment may' be changed by shift- -ing the several points of engagement between the rod 38 andi-'the segment or yoke 26 and between the rod 32 and the segment or yoke.Y This provides for a permanent adjustment of the parts to suit varying conditions: The tension of the springs 39 and 45 may be regulated by means of the wing nuts 42 and 49 and further than this, while the machine is running an adjustment of the shoe 3 and of the wind-board Vmay be secured by adjusting the Wingnut 37. As before stated, this permits the adjustment to be secured even while the machine is running. More than this, the action of spring 45 may be adjusted so as to secure a perfect balance of the pendulum and a perfect balance of the shoeby connecting the lower end of the rod 46 to one side or the other of the arcuate portion 30 of the yoke 26 as by connecting the rod 46 in either one of the holes 31EL to one side or the other of the center.

While I do not wish'to be limited to any particular form of shoe, I have shown a shoe, the rear end of which is cut away at 58 to accommodate the eccentrics 15 and the headsof the eccentric rods. This shoe eX- tends upward and rearward as at 59 to form a receiving chute and downward and rearward as at 60'to form a discharge chute, discharging into the casing 7 of the spiral conveyer 8. An apron or band conveyer 61 carries the grain rearward and discharges it upon a supplementary chute 62 62 is pivoted permits the chute 62 to conform to all the movements ofthe shoe 3.

I have illustrated in vFigpl a threshing machine in which the material after it passes through the screenl 2Q is carried upward through the elevator'casing 65 and eventually `delivered into a recleaning shoe 66 illustrated in dotted lines in Fig. 1. This recleaning shoe has exactly the same form as that previously described and is operated in the same manner. It is supported upon angle bars 67 which at their forward ends are mounted upon the recleaner fan shaft 68, these arms extending rearward of the shoe and lbeing connected by links 69 to arms .70 mounted upon a i rock shaft 71. From this rock shaft 71 extends a radius arm 72 which is loosely mounted upon the shai'tV and an arm .73 which is keyed upon the shaft. This arm 73 has exactly the same construction 'as the arm'l. A link 7 4 passes downward from -\the radius rod to the forward arm of the yoke 26 to which it is pivoted at 77. The Wind-board 78 which is used in conjunction with the shoe 66 is mounted upon a rock shaft 7 9 having ,projecting therefrom the crank 8O which is perforated at a plurality of points and is pivotally connected to a link or connecting rod 75 which extends downward and rearward and is pivoted at 77 to the yoke 26.

V1When the machine is moving up hill and the yoke moves rearward under theaction of the pendulum, the rear end of the 'shoe 66 will be raised and the angle of the Windboard will be changed to correspond. When the machine is moving down hill, the rear end of the shoe. will be correspondingly lowered and the angle of the Wind-board correspondingly changed. The shoe Will be reciprocated along the angle bars 67 by means of eccentrics mounted upon theshaft 68, these eccentrics engaging the heads of eccentric rods in precisely the same manner as previously described for the shoe 3.

It' isl to be particularly pointed out that my system of suspending and balancing the screen and operating the screen by means of eccentrica, secures a very perfect action of the screen under all circumstances of operation, and whether the machine is traveling up hill, down hill or on a level. The

' screens inthis type of harvester are usually supported at their forward ends by sus-` pension cranks by which an oscillating or jigging motion is given to the screens, and

variatlons 1n inclination of the machine causes variations in relations of the cranks to the. screens so that the-motion offthe screen changes With changes in the inclination of the machine as a whole to such a degree that 'the'screen will not Work propoperating mechanism, 4the motion of the v screen shoe and the relation of the eccentrics to the shoe is the same at all times Without regard to the inclination of the machine. Y

Inasmuch' as myinvention relates entlrely .j to means for securing horizontality of the screen lslices under all circumstances. of op- -eration and' has nothing to do with either the details of construction of the threshing' down parallel to the vertical flange of the angle iron 10 and dispose .in this recess the roller 84. This is a very simple and'cheapv form ofmounting and permits the shoe to reciprocate with the least possible friction.

I have tried this invention in'practical, Ause andfind that it is entirely eli'ective in its operation and makes practical the use of a combined harvester in a country which is extremely hilly and where ordinarily a combined harvester could not be used. IlVhile I have illustrated. many details of construction, .I do not Wish to be limited thereto as it is`obvious thatmany changes might be made Without departing from the'spirit .of the invention.

What I claim is: y

. 1. In a harvestingmachine, the combination with a pivoted screen, of gravity actuated means for'constantly and automatically 4 urgingsaid pivoted` screen into predetermined-.relation to a vertical plane, and re siliently acting means. resisting the movement of the gravityactuated means.

2. In a harvesting machine, arpivoted screen supporting member, a reciprocating screen slidingly mounted upon said member,

means for reciprocating said screen longitudinally upon said supporting member, and.

gravity actuated means constantly urging said pivoted supporting member into predej termined relation to a vertical plane.-

3. In a harvesting machine, a screen 'supporting member pivotedat one end, a gravity actuated pendulum voperatively connected to fthe free end of the screen supporting member 'to constantly urge it into a'predetermined relation to va vertical plane, anda reciprocating screen slidingly mounted upon the pivoted-supporting member for movement longitudinallytherealong y 4. In a harvesting machine, a supporting member, pivotally supported' at one end, a pendu1um,cper'ative connections between the pendulum and thel free end of `the supporting member 'wherebythe latter shalll be urged into predetermined relation to a vertical plane, a screen'slidingly mounted upon the supportingA member for reciprocation longitudinally thereon, and means disposed rearward of the supporting member for remasses t., in a harvesting machine, 1a -piveted eup-v porting member, 'a screen mounted thereon or independent 'ieciproca'tiom a wind-board coacting with 'the screen and mounted lfor rotative movement around a 'longitudinai axis, lgravity "actuated mean-s operatively to a vertical plane and the Wind-bcardin'topredetermined angular relation tothe screen, and 'means for reciprocatingth screen..

6. 11i-'a harvesting machine, a supporting member pivotally mounted 'at 'one endga screen shoe supported thereon, a gravity actuated pendulum operatively connected to the supporting member to raise or lower it as the pendulum swings in one direction or the'other, and a spring operatively connect# ed to the pendulum for counter-balancing the weigiht loi the supporting-member and the screen shoe. y i

' i. in a harvestin machine, a supporting member pivotally mounted at one end, a screen shoe supported thereon, a. gravity. actuated pendulum opei'ativeiy connected to the supporting member to raise or lower it as the pendulum swings in' one direction or the other, a spring operatively connected to the pendulum for counterbalancing the weight of the supporting member 'and the screen shoe, and means for adjusting the ten# sion of said spring. .j

8. ln a harvesting machine, a rock shaft, arms extending outward from the rock shaft, supporting members pivoted eafchjat one end and each operatively connected at its other end to said a-rms, a screen shoe c'arried by said supporting members, and gravity actuated means operatively connected to` said rock shaft and acting to counterbaia'ce the supporting members and the shoe.

9. ln a harvesting machine, a shaft, sup# porting members loosely mounted upon the shaft atone end` a rock shaft, arms extend# ing from the rock shaft and operatively con# nected at their ends to the supporting menibers, a shoe mounted upon said supporting" members, a. pendulum, an arm extending from the rock shaft, and a link connecting said arm to said pendulum.

10. ln u harvesting machine, ya constantly rotating shaft, supporting membersloosely mounted each 'at one end upon said shaft for movement in a vertical plane, a rock shaft, arms mounted thereon and extending parallel to thesupporting1 members 'y and operatively` connected at their ends'tothe s upporting members, a reciprocatable 4shoe mounted. upon the supporting members, means mountedon the rst. named shaft for reciprocating said shoe, and gravity actuate means operatively connected tothe second named shaft counterbalancin,itA th* weight ofthe supporting members and shoe.

supported shoe, a pendulum,

-below its pivotal less in strength than the first named spring.

11. a harvesting machine, a pivctally supported screen shoe, a pendulum, a yoke mounted upon the pendulum, the pivctal center of the pendulum and of the yoke be i'rrg coincident, operative connections between the yoke and the screen shoe, and a contractile spring operatively connected to' the lyoke acting to counterbalance the weight or the screen shoe.

'12. In 'a harvesting machine, a pivctally supported screen shoe, a pendulum, a yoke mounted upcn thel pendulum, the pivotal center of the pendulum and of thcvoke belng coincident, operative connections between 'the yoke and the screen shoe. a ccntractile Ispring operatively connected to the yoke acting to counterbalance the weight of the screen shoe, and vacontr'actile spring disposed above the pendulum operatively connected to the latter and normally extend; ing in line with the pendulum and adapted to assist a movement of the yoke against the forceof ithe `first namedfspring or assist in a movement of the yoke in the direction of. contraction .of said first named spring.

- v13. In a harvesting machine, a pivctally a triangular yoke attached to the pendulum and rctating about the same center, operative conn'ecl tions between said yoke and theslice, a ccntractile spring operativelyconnected to' the yoke to move it in a direction to raise the free end of the shoe, and an auxiliary ccntractile`spring supported normally in line with the pendulum and connected at its free I end'to the pendulum below the pivotal point' of the yoke. y i

14e. In a harvesting machine, a shoe pivot- -ally supported at one end, a pendulum, a

triangular yoke moving' with the pendulum 105 about lthe same a'Xis of rotation, operative connections between the yoke and the shoe td cause coincident movement of the yoke and shoe, a contractile spring connected to the yoke'to urge it in a direction to raise the 1M free end of the shoe, and "a contractile spring supported in a vertical 'position above the pendulum and normally inline therewith, said spring being connected to the pendulum v, point, said spring being 15.- Ain a harvesting machine, a shoe pivot'- ally supported at lone end. a pendulum, a triangular yoke moving with the*- pendulum about the same aXis'of rotation, operative 12'@ connections between the yoke and the shoe- 'to cause coincident movement oi. the yoke and shoe, u contractile spring connected to the yoke to urge itA in a direction to raise the free end ofthe shoe,- acontractile spring supported in a vertical position above the pendulum andY normally inline therewith, said spring being connected to the pendulum' below its pivotal point, said spring being-I less n strength than the lfirst named. spring,

l6 .n t maaoa means for adjustably tensioning the first named spring, and means for adjustably tensioning the second named spring.

16. In a harvesting machine, a rock shaft, a Shoe pivotally supported at one end and being operatively supported by the rock shaft, the weight of the shoe acting to ro'- tate the rock shaft in one direction, a pendulum, a radially disposed arm on the rock shaft, a connecting rod operatively connected to said rod at one end and at the other operatively connected to the pendulum and means for increasing or decreasing the distance between the end of the rod and the coacting end of the pendulum.

17. In a harvesting machine, a rock shaft, a shoe pivotally supported at one end and the other end being operatively supported by the rock shaft, the weight of the shoe acting to rotate the rock shaft in `one direction, a pendulum, a triangular yoke mounted 'upon the pendulum, a radius rod loosely mounted on the rock shaft, a connecting rod extending between said radius rod and the yoke, a radial arm extending outward` from the rock shaft, and a pivoted rod mounted a screen shoe connected to the vrock'shaft and acting to rotate it in one direction, means operatively connected to the rock shaft and yieldingly resisting said rotation, and a pendulum operatively -connected to said rock? shaft to cause its rotation.

20. '-In a harvesting machine, a rock shaft,

v a screen shoe operatively vconnected to the rock shaft and the-weightof said shoe acting to turn the rock shaft in one direction',la pendulum operatively connected to said rock shaft, and means operatively connected to said pendulum and acting to counterbalance the weight of the shoe.

21. In a harvestingmachine, a rock shaft, a shoe operatively connected to said rock shaft and acting to rotate the rock shaft in one direction, a radial arm on the rock shaft,

a pendulum, a yoke mounted upon the lpendulum, a connecting rod disposed between the yoke and the armv'of therock shaft, a

19. In a harvesting machine, a rock shaft,v

contractile springconnected to said yoke and -acting to counterbalance the weight of u the shoe, a rotatably mounted wind-board coacting with the screenl shoe, an armextending from the pivotal axis of the windboard, and operative connections between the wind-board armandthe arm on the rock shaft whereby the wind-board may be turned in correspondence with the angular movement of the shoe.

22. Ina harvesting machine, a constantly rotating shaft, a rock shaft supported above l the iirst named shaft, parallel supporting membersA loosely mounted at their rear ends upon'the first named shaft, arms mounted upon the second named shaft and extending out parallel to the supporting members, links connecting `the ends of the supporting members to the ends of the said arms, a screen shoe slidingly mounted upon the sup Vporting members, eccentrics mounted upon the irstnamed shaft, eccentric rods coacting with, said eccentrics and engaging the screen shoe, and gravity actuated means for counterbalancing the weight of the supporting members and the screen shoe and acting tol urge said screen shoe at all times into predetermined relation to a vertical plane.

23. Ina harvesting machine, a shaft, parallel screen supporting members forming` tracks and pivoted each at one end upon said shaft, a screenshoe slidingly mounted upon said tracks, eccentrics mounted on the shaft behind said shoe, eccentric-rods engaging said 'eccentrics and engaging at their extremities with'the shoe, and means for balancing said supporting members.

. 24. In a harvesting machine, a transverse shaft, parallel supporting bars extending outward from said shaft and pivotally connected thereto, a screen shoe slidingly mounted upon-said bars, eccentrics on the shaft, eccentric 'rods mounted on said eccentrics and connected to the screen shoe, and means for yieldingly supporting the ends of the said. supporting bars.

25. In a harvesting machine of the character described, a screen shoe, a supporting member for the screen shoe pivotally supported at one end, eccentrics having theiraxes coincident with theaXis of the said supporting member, eccentrlc rods connectlng the shoe to the eccentrics, and means for yieldingly supporting the vother end of the said supporting member.

In' testimony whereof. I aiiix my signature in presence oftwo Witnesses. v

...-.WILLIS M. RHODES. [Ls] Witnessesz u i J. D. YoAKLnY,

.-1: FREDERIC B. WRIGHT. 

